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lbci-5.2.c
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lbci-5.2.c
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/*
* lbci.c
* Lua bytecode inspector
* Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
* 25 Apr 2013 13:18:03
* This code is hereby placed in the public domain.
*/
#define LUA_CORE
#include "lua.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "lobject.h"
#include "lstate.h"
/* this allows lbci to be a shared library */
#define luaP_opnames lbci_opnames
#define luaP_opmodes lbci_opmodes
#include "lopcodes.c"
static const Proto* Pget(lua_State *L, int i)
{
if (lua_isuserdata(L,i)) return lua_touserdata(L,i);
if (!lua_isfunction(L,i) || lua_iscfunction(L,i))
{
const char *msg = lua_pushfstring(L, "Lua function expected, got %s",
luaL_typename(L,i));
luaL_argerror(L,i,msg);
return NULL;
}
return ((LClosure*)lua_topointer(L,i))->p;
}
#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-")
static int do_getupvalue(lua_State *L) /** getupvalue(f,i) */
{
const Proto* f=Pget(L,1);
int i=luaL_checkinteger(L,2);
if (i<=0 || i>f->sizeupvalues || f->upvalues==NULL) return 0;
i--;
lua_pushstring(L,UPVALNAME(i));
lua_pushinteger(L,f->upvalues[i].instack);
lua_pushinteger(L,f->upvalues[i].idx);
return 3;
}
static int do_getlocal(lua_State *L) /** getlocal(f,i) */
{
const Proto* f=Pget(L,1);
int i=luaL_checkinteger(L,2);
if (i<=0 || i>f->sizelocvars || f->locvars==NULL) return 0;
i--;
lua_pushstring(L,getstr(f->locvars[i].varname));
lua_pushinteger(L,f->locvars[i].startpc+1);
lua_pushinteger(L,f->locvars[i].endpc+1);
return 3;
}
static int do_getconstant(lua_State *L) /** getconstant(f,i) */
{
const Proto* f=Pget(L,1);
int i=luaL_checkinteger(L,2);
if (i<=0 || i>f->sizek || f->k==NULL) return 0;
i--;
lua_pushnil(L);
L->top[-1]=f->k[i];
return 1;
}
static int do_getfunction(lua_State *L) /** getfunction(f,i) */
{
const Proto* f=Pget(L,1);
int i=luaL_checkinteger(L,2);
if (i<=0 || i>f->sizep) return 0;
i--;
lua_pushlightuserdata(L,f->p[i]);
return 1;
}
#define MYK(x) (-1-(x))
static int do_getinstruction(lua_State *L) /** getinstruction(f,i) */
{
const Proto* f=Pget(L,1);
int pc=luaL_checkinteger(L,2);
if (pc<=0 || pc>f->sizecode || f->code==NULL) return 0;
pc--;
{
const Instruction* code=f->code;
Instruction i=code[pc];
OpCode o=GET_OPCODE(i);
int a=GETARG_A(i);
int b=GETARG_B(i);
int c=GETARG_C(i);
int ax=GETARG_Ax(i);
int bx=GETARG_Bx(i);
int sbx=GETARG_sBx(i);
int line=getfuncline(f,pc);
if (line>0) lua_pushinteger(L,line); else lua_pushnil(L);
lua_pushstring(L,luaP_opnames[o]);
switch (getOpMode(o))
{
case iABC:
lua_pushinteger(L,a);
if (getBMode(o)!=OpArgN) lua_pushinteger(L,ISK(b) ? (MYK(INDEXK(b))) : b);
else lua_pushnil(L);
if (getCMode(o)!=OpArgN) lua_pushinteger(L,ISK(c) ? (MYK(INDEXK(c))) : c);
else lua_pushnil(L);
break;
case iABx:
lua_pushinteger(L,a);
if (getBMode(o)==OpArgK) lua_pushinteger(L,MYK(bx)); else lua_pushinteger(L,bx);
lua_pushnil(L);
break;
case iAsBx:
lua_pushinteger(L,a);
lua_pushinteger(L,sbx);
lua_pushnil(L);
break;
case iAx:
lua_pushinteger(L,MYK(ax));
lua_pushnil(L);
lua_pushnil(L);
break;
}
switch (o)
{
case OP_JMP:
case OP_FORLOOP:
case OP_FORPREP:
case OP_TFORLOOP:
lua_pop(L,1);
lua_pushinteger(L,sbx+pc+2);
break;
default:
break;
}
}
return 5;
}
#define setsfield(L,n,v) lua_pushstring(L,v); lua_setfield(L,-2,n)
#define setifield(L,n,v) lua_pushinteger(L,v); lua_setfield(L,-2,n)
#define setbfield(L,n,v) lua_pushboolean(L,v); lua_setfield(L,-2,n)
static int do_getheader(lua_State *L) /** getheader(f,i) */
{
const Proto* f=Pget(L,1);
const char* s=f->source ? getstr(f->source) : "=?";
if (*s=='@' || *s=='=')
s++;
else if (*s==LUA_SIGNATURE[0])
s="(bstring)";
else
s="(string)";
lua_newtable(L);
setsfield(L,"source",s);
setifield(L,"line",f->linedefined);
setifield(L,"lastline",f->lastlinedefined);
setifield(L,"instructions",f->sizecode);
setifield(L,"params",f->numparams);
setbfield(L,"isvararg",f->is_vararg);
setifield(L,"slots",f->maxstacksize);
setifield(L,"upvalues",f->sizeupvalues);
setifield(L,"locals",f->sizelocvars);
setifield(L,"constants",f->sizek);
setifield(L,"functions",f->sizep);
return 1;
}
static int do_setconstant(lua_State *L) /** setconstant(f,i,v) */
{
const Proto* f=Pget(L,1);
int i=luaL_checkinteger(L,2);
if (i<=0 || i>f->sizek || f->k==NULL) return 0;
i--;
lua_settop(L,3);
f->k[i]=L->top[-1];
return 0;
}
static const luaL_Reg R[] =
{
{ "getconstant", do_getconstant },
{ "getfunction", do_getfunction },
{ "getheader", do_getheader },
{ "getinstruction", do_getinstruction },
{ "getlocal", do_getlocal },
{ "getupvalue", do_getupvalue },
{ "setconstant", do_setconstant },
{ NULL, NULL }
};
LUALIB_API int luaopen_bci(lua_State *L)
{
luaL_newlib(L,R);
return 1;
}